lucee5: writeOutput(round(0.35/100*45000)) = 157 lucee6: writeOutput(round(0.35/100*45000)) = 158 I need to reproduce this bug on Lucee 6 to provide backward compatibility in my application. Can I do it by type casting or something else?

That's a weird behavior, but Lucee 5 is consistent with ACF: https://www.trycf.com/gist/47ac33b261daa79669b97556faabe1c3/lucee6?theme=monokai It's weird because

0.35/100*45000

=

157.5

which should round up to

158

(so Lucee 6 is the only one that gets it correct), but ACF produces

157

like Lucee 6 does.

weird 2, round function does right thing, must be internal calculation flow somewhere

I wonder if precisionEvaluate() would help?

All of the versions will correctly round a hardcoded

157.5

up to

158

, which tells me there must be some floating point issue happening with the way the value is stored.

with precisionEvaluate() on 2021 and 2023, result is 158

I found solution how to reproduce it on lucee6: x = javaCast("float", 0.35) / javaCast("float", 100) * javaCast("float", 45000); writeOutput(round(x));

This was recently discussed on the Lucee forum: https://dev.lucee.org/t/validate-integer/14563/4